Most option values are simply unused or ignored and in practice the
majory of codecs only need to check whether to enable rle or not.

Add appropriate codec private options which better expose the allowed
features.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

We do not need to do a full setup like for a real frame, just allocate a
buffer and set cur_pic(_ptr).

EOVERFLOW seems to be unavailable on certain platforms.

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Checking the codec context parameters to find out this information is
far too unreliable to be useful, so it is safer to assume B-frames are
always present.

Also, stop using AVCodecContext for storing the stream parameters.

Do not access the encoder options, since it makes no sense when the
AVStream codec context is not the encoding context.

Do not access the encoder options, since it makes no sense when the
AVStream codec context is not the encoding context.

Deprecate AVCodecContext.vbv_delay

This is similar to what is done for AVStream.

Fall back to maximum DPB size if the level is unknown.

This should be more spec-compliant and does not depend on the caller
setting has_b_frames before opening the decoder.

The old behaviour, when the delay is supplied by the caller setting
has_b_frames, can still be obtained by setting strict_std_compliance
below normal.

That is a more appropriate place for it, since it is not allowed to
change between slices.

According to the spec, the reference list for a slice should be
constructed by first generating an initial (what we now call "default")
reference list and then optionally applying modifications to it.

Our code has an optimization where the initial reference list is
constructed for the first inter slice and then rebuilt for other slices
if needed. This, however, adds complexity to the code, requires an extra
2.5kB array in the codec context and there is no reason to think that it
has any positive effect on performance. Therefore, simplify the code by
generating the reference list from scratch for each slice.

Currently, the frame stride is passed in bytes, while the MC buffer size
is in int16_t elements, This can be confusing, so pass both strides in
bytes.

This should allow for more efficient SIMD.

This should allow for more efficient SIMD.

This should allow for more efficient SIMD.

Keep the C versions as they are now, to allow the compiler to inline the
interpolation coefficients.

Avoid the warning `-Wempty-body`.

The end-marked was typoed in

f7edcac0

Bug-Id: 761

Unbreak make check.

This fixes builds with --disable-vda, which previously failed with
undefined references to CVImageBuffer* and CVPixelBuffer* functions.
Signed-off-by: Martin Storsjö <martin@martin.st>

While pr is a valid POSIX.1 command, its usage in configure
is a little borderline and is possible to replace it with
printf.

Bug-Id: 913
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

It amounts to about 1/2 of the warnings generated and does not help
spotting anything useful.

Avoid false positives while syncing.

Bug-Id: ffmpeg/4086
Bug-Id: 879
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>